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Old 27th Jan 2013, 03:45
  #181 (permalink)  
Join Date: Feb 2002
Location: UK
Age: 55
Posts: 2,919
Main bat is connected to the hot bat bus through a diode module to ensure the bat only gets charged through its charger. APU bat has no such protection as it is only connected to the APU start circuit (and nav lights when towing without APU.)

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